Various corner cases.
A blank literal text.
.. perl:: ''
:literal:
Return a null list.
.. perl:: ()
Return an undefined item.
.. perl:: (undef, "Hi")
Substitution item with null list.
.. |sub1| perl:: ()
Various corner cases.
A blank literal text.
.. perl:: ''
:literal:
Return a null list.
.. perl:: ()
Return an undefined item.
.. perl:: (undef, "Hi")
Substitution item with null list.
.. |sub1| perl:: ()